Effect of Dehumidifying Ventilation with a Heat Exchanger on Fruit Yield and Quality of Tomato under Forcing Culture in Low Sunshine Region

Ryu Katsutoshi, Ide Osamu, Tokunaga Emi, Moriyama Tomoyuki

doi:10.2503/hrj.17.415

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Other Title

熱交換器を用いた除湿換気が寡日照地域における促成トマトの収量・品質に及ぼす影響
ネツコウカンキオモチイタジョシツカンキガカニッショウチイキニオケルソクセイトマトノシュウリョウ・ヒンシツニオヨボスエイキョウ

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Abstract

<p>The effects of diurnal ventilation with a heat exchanger for dehumidifying were investigated to improve both the yield and quality of marketable tomato fruits grown in a greenhouse during winter. The heat exchanging ventilation based on the index of relative humidity lowered the temperature in the greenhouse. However, it ameliorated the inside conditions, such as decreasing humidity and reducing the period of dew condensation on the fruits. The concentration of carbon dioxide in the greenhouse remained higher than that of the control on cloudy days. Although the marketable yield from January to February decreased under the heat exchange ventilation, there was no significant difference in the total yield from January to May. In addition, the number of puffy fruits in March and April decreased, and total soluble solids from January to March were higher than those of tomato fruits cultivated in the control. Based on these results, it was revealed that tomato quality was improved compared with the control, while there was no significant difference in the total yield. Additionally it was suggested that the heat exchanging ventilation was effective as a dehumidifying technique for culture control.</p>

Journal

Horticultural Research (Japan)

Horticultural Research (Japan) 17 (4), 415-422, 2018

THE JAPANESE SOCIETY FOR HORTICULTURAL SCIENCE

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